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ICS to JSON Converter - Online Calendar Data Export

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ICS to JSON Converter

Convert iCalendar (.ics) files to structured JSON format instantly. All processing happens locally in your browser — no data is ever uploaded.

Drop your ICS file here

or click to browse

Supported: .ics files up to 10 MB
Try it with example data
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Events
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Todos
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Alarms
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File Size
Parsed Events Preview
JSON Output
Frequently Asked Questions
What is an ICS file?

ICS (iCalendar) is a universal calendar file format used by Google Calendar, Apple Calendar, Microsoft Outlook, Yahoo Calendar, and many other scheduling applications. It stores event details like title, date, time, location, reminders, and recurrence rules in a plain text structure defined by RFC 5545.

Why convert ICS to JSON?

JSON is the de facto data format for web applications and APIs. Converting ICS to JSON allows developers to easily integrate calendar data into JavaScript apps, dashboards, CRM systems, or any platform that consumes JSON. It also makes the data more human-readable and easier to manipulate programmatically.

Is my calendar data safe?

Absolutely. All processing happens entirely within your browser using client-side JavaScript. Your ICS file is never uploaded to any server, transmitted over the network, or stored anywhere. You can verify this by disconnecting your internet after loading the page — the conversion will still work perfectly.

What ICS components are supported?

Our parser handles VEVENT (events), VTODO (tasks), VJOURNAL (journal entries), VALARM (reminders/alarms), VTIMEZONE (timezone definitions), RRULE (recurrence rules), EXDATE (exception dates), and all standard iCalendar properties including attendees, organizers, geo coordinates, and custom X-properties.

How are recurring events handled?

Recurrence rules (RRULE) are preserved in their original format within the JSON output. The tool does not expand individual occurrences, as that would require a date range parameter. You can use the exported RRULE data with libraries like rrule.js to generate specific occurrence dates in your own application.

What about timezone data?

Timezone information (TZID, VTIMEZONE definitions) is fully preserved in the JSON output. Date-time values retain their original timezone identifiers. UTC dates (ending with 'Z') and floating dates are clearly distinguishable in the parsed result.

Which calendar apps export compatible ICS files?

Google Calendar, Apple Calendar (macOS/iOS), Microsoft Outlook, Yahoo Calendar, Thunderbird Lightning, Proton Calendar, Fastmail, Zoho Calendar, and virtually any calendar application that follows the iCalendar standard (RFC 5545) produces compatible ICS files.

Is there a file size limit?

The tool accepts ICS files up to 10 MB, which typically corresponds to tens of thousands of calendar events. For most personal and business calendars, this is more than sufficient. If you need to process larger files, consider splitting them into smaller chunks.

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